Story about no good muddle (6)
I believe the answer is:
tangle
'muddle' is the definition.
(thesaurus)
'story about no good' is the wordplay.
'story' becomes 'tale' ('tale' can be a synonym of 'story').
'about' is an insertion indicator.
'no' becomes 'n' (common abbreviation).
'good' becomes 'g' (abbreviation).
'n'+'g'='ng'
'tale' going around 'ng' is 'TANGLE'.
(Other definitions for tangle that I've seen before include "Twist confusedly" , "Trap < tall guy from Perth" , "Confused mess" , "Confuse" , "Twist together into a confusing mass" .)